CN201122234Y - Developing apparatus - Google Patents
Developing apparatus Download PDFInfo
- Publication number
- CN201122234Y CN201122234Y CNU2007200612802U CN200720061280U CN201122234Y CN 201122234 Y CN201122234 Y CN 201122234Y CN U2007200612802 U CNU2007200612802 U CN U2007200612802U CN 200720061280 U CN200720061280 U CN 200720061280U CN 201122234 Y CN201122234 Y CN 201122234Y
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- China
- Prior art keywords
- developer roll
- developer
- arc section
- developing apparatus
- blade
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Abstract
The utility model discloses a developing unit, an elastic contact free end formed by a powder discharge blade and a developing roller comprises a contact part and an extension part. The contact part presents a first circular arc section on the cross section of the contact part, the curvature radius of the first circular arc section is 0.2-1 mm. The selection of the curvature radius with the number range can possibly reduce the scart and the abrasion of the blade to the periphery of the developing roller, and lower the friction resistance between the developing roller and the powder discharge blade, thereby the drive torsion torque required to be input is reduced, and the service life of the developing unit and the developing roller is prolonged. On the other hand, the circular arc free end can exert the stable and reliable contact elasticity on the developing roller by depending on the elastic deformation produced by the stress of the circular arc, thereby causing the blade of the powder discharge blade to achieve the purpose of controlling the layer thickness of developing agent on the developing roller effectively.
Description
Technical field
The utility model relates to a kind of developing apparatus that is applied in the laser class image forming apparatus.
Background technology
In laser class imaging device, for example laser printer, laser copier or facsimile recorder etc. all are provided with the developing apparatus that the electrostatic latent image that is formed on the photosensitive drums is developed.Present developing apparatus generally includes: be used for the box body of receiving photographic developer, be provided with puddle support in it; Rotatably be supported in developer roll and powder feeding roller on the box body; Be used to control the powder delivery cutter of developer layer thickness on the developer roll, comprise knife rest and the blade that is fixed on the knife rest, this blade has the free end that forms Elastic Contact with described developer roll.Wherein, developer roll is made up of a steel axle and the rubber layer that is looped around on the steel axle, and this rubber layer can produce certain elastic deformation; Powder feeding roller is made up of a steel axle and the foam sponge layer that is looped around on the steel axle, and this foam sponge layer can be compressed.
The groundwork principle of above-mentioned laser class imaging device is: at first, image of printing or duplicating waiting or literal form electrostatic latent image on the surface of photosensitive drums; Then, to the agent of developer roll supplying developing, and then utilize developer that the electrostatic latent image on the photosensitive drums is developed by developer roll again, promptly on photosensitive drums, have the zone of image or literal to fill uniform developer by powder feeding roller; At last, image that this developer is filled or words transfer printing pass through photographic fixing again, thereby obtain image or literal to medium.In above-mentioned developing process, the developer particulate that has faint electric weight is under the effect of electric field force, and the outside surface of autography roller moves to the electrostatic latent image zone on the photosensitive drums.The developer particulate will directly influence the picture quality of filling with developer on the photosensitive drums in the thickness and the uniformity coefficient on developer roll surface, and its net result will directly influence to be printed or copying quality.The powder delivery cutter is regulated the developer layer thickness that is adsorbed on the developer roll, meanwhile, utilizes the friction between powder delivery cutter and developer, makes the certain electric charge of developer band.Under the double action in change of developer roll electromotive force and the formed magnetic field of developer roll, the developer particulate forms at the developer roll outside surface has certain thickness uniform developer layer.
In above-mentioned developing apparatus, the free end of powder delivery cutter is parallel to the developer roll axis and extends along the developing regional of its external cylindrical surface at developer roll, the external cylindrical surface of this free end and developer roll keeps Elastic Contact, and this elasticity is provided by the material and the shape structure of powder delivery cutter itself.Assembling powder delivery cutter makes before its location, the magnitude of interference that must keep appropriateness between the external cylindrical surface of its free end and developer roll, after the powder delivery cutter location, the external cylindrical surface of powder delivery cutter free end contact developer roll, this magnitude of interference forces powder delivery cutter blade generation elastic deformation, and then obtain suitable elastic force, make between the external cylindrical surface of powder delivery cutter free end and developer roll and form Elastic Contact.In the prior art, keeping the powder delivery cutter free end of Elastic Contact to have comparatively sharp keen cutting edge with the developer roll surface, make free end and developer roll surface contact area very little, almost is the line contact.Since the powder delivery cutter prerequisite elasticity determined it to have bigger hardness, developing apparatus its developer roll surface in long-term use will be subjected to the long-time friction of powder delivery cutter, cause the developer roll surface progressively to produce cut, cause developer roll surface development agent deposition inhomogeneous, or the white space that the Nonvisualization agent is adsorbed occurs, and then have a strong impact on printing effect.
Because developer roll and powder delivery cutter keep the Elastic Contact relation, the rubber layer of developer roll can produce certain decrement, therefore when developer roll is in the duty of rotation, have certain friction force between developer roll and the powder delivery cutter, friction can make developer roll produce certain wearing and tearing for a long time.If the selection of developer roll and powder delivery cutter is improper or process exceeds certain error range, the decrement of the rubber layer on the developer roll may exceed predetermined decrement so, make the force of sliding friction between developer roll and the powder delivery cutter enlarge markedly, the wearing and tearing meeting of developer roll is more serious, the input torque of developing apparatus also will increase simultaneously, easily cause the distortion of driving members such as gear, make developing apparatus not work normally, even can influence the serviceable life of laser class imaging devices such as printer.
Simultaneously, the visual situation of the electrostatic latent image on the photosensitive drum surface, promptly the developer image is subjected to the supply of developer in the developing regional and the influence of electrical characteristics.The situation on the supply of the interior developer of developing regional and electrical characteristics are sticked to developer roll by developer the outer circumference surface or the situation that forms of developer layer are determined.The formation situation of the developer layer on the outer circumference surface of developer roll is mainly by the state decision of powder delivery cutter against the outer circumference surface of developer roll.Thereby the developer image on the photosensitive drum surface is subjected to the influence of powder delivery cutter against the state of the outer circumference surface of developer roll.
Summary of the invention
The purpose of this utility model is to provide a kind of developing apparatus that reduces the powder delivery cutter to the scraping and the wearing and tearing of developer roll.
For achieving the above object, the utility model has adopted following technical scheme: design a kind of developing apparatus, comprising: the box body that is used for receiving photographic developer; Rotatably be supported in the developer roll on the box body; Be used to control the powder delivery cutter of developer layer thickness on the developer roll, this powder delivery cutter has the free end that forms Elastic Contact with described developer roll; Wherein, the free end of described powder delivery cutter comprises a contact site and an extension; Described contact site is first arc section on its xsect, its radius-of-curvature is between 0.2mm～1mm.
Described extension can be second arc section on its xsect, its radius-of-curvature is more than or equal to the radius-of-curvature of described first arc section, and first arc section and second arc section are positioned at the same side of their common tangents.
Described extension also can be linearly on its xsect section, this straight-line segment and described first arc section are tangent or crossing.
The public string of described contact site and developer roll with described contact site and the tangent line of extension junction between the angular range that forms be 20 °～60 °, more excellent, this angular range is 40 °～50 °.Such angular range can guarantee that powder feeding roller obtains optimum powder feeding effect in the time of the developer roll powder feeding.
Developing apparatus with said structure because the free end of its powder delivery cutter is by the contact site and developer roll formation Elastic Contact of circular shape, this contact site in the radius-of-curvature of first arc section that forms on the xsect between 0.2mm～1mm.Select the radius-of-curvature of above-mentioned numerical range, can reduce of scraping and the wearing and tearing of the blade of powder delivery cutter as much as possible to the developer roll side face, reduce the frictional resistance between developer roll and the powder delivery cutter, thereby reduce the driving torque of required input, prolong the serviceable life of developing apparatus and developer roll thereof; On the other hand, the free end of this circular shape can rely on the elastic deformation of the stressed generation of circular arc, applies stable and contacts elastic force reliably to developer roll, thereby make the blade of powder delivery cutter reach the purpose of developer layer thickness on effective control developer roll.
Description of drawings
Fig. 1 is the cut-open view of a kind of preferred implementation of the utility model;
Fig. 2 is the skeleton view of the cutter of powder delivery shown in Fig. 1;
Fig. 3 is the cross-sectional view of powder delivery cutter shown in Figure 2;
Fig. 4 is the local amplification view of the free end of powder delivery cutter shown in Figure 3 when contacting with developer roll.
Below in conjunction with accompanying drawing and preferred implementation the utility model is done to describe in further detail.
Embodiment
Fig. 1 is to a kind of preferred implementation of the present invention shown in Figure 4, and developing apparatus 1 comprises: have the box body 3 in developer-accommodating storehouse 2, this holds and is provided with puddle support 4 in the storehouse 2, is used for developer is stirred; Developer roll 5 and powder feeding roller 6 rotatably are supported on the box body 3, form extruding between developer roll 5 and the powder feeding roller 6 and contact.Wherein, developer roll 5 is made up of a steel axle and the rubber layer that is looped around on the steel axle, and this rubber layer can produce certain elastic deformation; Powder feeding roller 6 is by a steel axle and is looped around the spongy layer of being made by polyester or polyethers material on the steel axle that this spongy layer can be compressed.The end of developer roll 5 and bottom are provided with seal 10, and seal 10 forms extruding with developer roll 5 side faces and contacts, thereby prevent that the developer in the box body 3 from leaking from the end and the bottom of developer roll 5.
Referring to Fig. 1, when developing apparatus 1 work, backplate before the developer roll 57 is removed, made the part of developer roll 5 side faces relative with photosensitive drums (not shown) surface, the circumferential surface of developer roll 5 and powder feeding roller 6 rotates with specific linear velocity along the direction of arrow shown in Figure 1 respectively.Powder feeding roller 6 can be given developer roll 5 with developer feeding on the one hand, and the residual carbon dust in back that developer roll 5 can be developed on the other hand scrapes; Developer roll 5 so with developer feeding to photosensitive drum surface, thereby the electrostatic latent image on the photosensitive drums is become visual developer image, electrostatic latent image by the exposure assembly laser radiation is formed by photoconductive effect at photosensitive drum surface; Along with the rotation of photosensitive drums, the developer image that is supported on the photosensitive drum surface is transferred on the recording medium by unshowned transfer roll.
Referring to Fig. 1 to Fig. 4, developer roll 5 tops are provided with the powder delivery cutter 8 that is used to control developer layer thickness on the developer roll 5, and this powder delivery cutter 8 comprises knife rest 81 and the blade 82 that is fixed on the knife rest 81, and knife rest 81 is fixed on the box body 3 by screw 84.Blade 82 is made by stalloy, and it has the free end 83 that forms Elastic Contact with developer roll 5 side faces, and this free end 83 extends to upstream one side of developer roll 5 sense of rotation.Blade 82 passes through the part of free end 83 with predetermined pressure extrusion developer roll 5 side faces, and developer is remained on therebetween, and the developer layer of predetermined thickness is formed on the side face of developer roll 5.
Referring to Fig. 4, the free end 83 of blade 82 comprises the contact site 831 of a circular shape and the extension 832 of a circular shape, contact site 831 forms certain contact area with developer roll 5 side faces, forms developer entrance space 9 between extension 832 and developer roll 5 side faces; Contact site 831 and extension 832 are rendered as first arc section and second arc section respectively on their xsect.1 pair of developer roll 5 of the radius of curvature R of first arc section has very important influence, under the certain prerequisite of the contact pressure maintenance of blade 82 and developer roll 5, if this radius of curvature R 1 is too little, the contact area of contact site 831 and developer roll 5 will be very little, and contact stress is just very big, causes the wearing and tearing of developer roll 5 side faces easily; And if this radius of curvature R 1 is too big, blade 82 just can't effectively be controlled the developer layer thickness on the developer roll 5.Therefore, this radius of curvature R 1 should be controlled between 0.2mm～1mm, and even more ideal radius-of-curvature is 0.4mm～0.6mm, for example is about 0.5mm.Select the radius of curvature R 1 of above-mentioned numerical range, make the blade 82 of powder delivery cutter can effectively control developer layer thickness on the developer roll 5, can reduce scraping and wearing and tearing again as much as possible developer roll 5 side faces.Above-mentioned free end 831 is owing to be designed to circular shape, so can form curved surface between blade 82 and the developer roll 5 and contact, and both are improved largely at the contact smoothness properties of contact area.Like this, can reduce on the one hand the scraping of 82 pairs of developer roll 5 side faces of blade, the free end 83 of this circular shape can rely on the elastic deformation of the stressed generation of circular arc on the other hand, applies stable and contacts elastic force reliably to developer roll 5.The radius of curvature R 2 of second arc section that the extension 832 that is connected with contact site 831 one presents on xsect is greater than the radius of curvature R 1 of first arc section, and the public string L1 of contact site 831 and developer roll 5 is with forming angle α between the common tangent L2 of contact site 831 and extension 832, and first arc section and second arc section are positioned at the same side of their common tangent L2.In developing apparatus, the developer particle layer that is sent on developer roll 5 side faces passes contact area between developer roll 5 and the blade 82 owing to the conveying capacity that is subjected to origin autography roller 5 with from the shear stress that the adjustment power of blade 82 is produced.Above-mentioned angle α is excessive or too smallly all can cause having some setbacks of powder feeding, and the too small developer that causes easily of angle α stops up, and makes the developer can't be smoothly by the contact area between developer roll and the blade; Angle α is excessive then can't to form enough funneling effects, developer is flowed away from blade next door easily and does not have enough developers to flow into contact area between developer roll and the blade.Therefore, the angular range of angle α is controlled at 20 °～60 °, even more ideal angular range is 40 °～50 °, for example is about 45 °, at this moment can obtain the mobile and powder feeding effect of ideal developer.
In other embodiment, above-mentioned extension 832 is the radius-of-curvature that second arc section also can equal first arc section on xsect.In addition, this extension 832 can also be a straight-line segment on xsect, and this straight-line segment and first arc section are tangent or crossing.
Above-described only is preferred implementation of the present utility model; should be pointed out that for the person of ordinary skill of the art, do not breaking away under the inventive concept prerequisite of the present utility model; can also make some distortion and improvement, these all belong to protection domain of the present utility model.
Claims (6)
1, developing apparatus comprises
The box body that is used for receiving photographic developer;
Rotatably be supported in the developer roll on the box body;
Be used to control the powder delivery cutter of developer layer thickness on the developer roll, this powder delivery cutter has the free end that forms Elastic Contact with described developer roll;
It is characterized in that:
The free end of described powder delivery cutter comprises a contact site and an extension;
Described contact site is first arc section on its xsect, its radius-of-curvature is between 0.2mm～1mm.
2, according to the described developing apparatus of claim 1, it is characterized in that:
Described extension is second arc section on its xsect, its radius-of-curvature is greater than the radius-of-curvature of described first arc section, and first arc section and second arc section are positioned at the same side of their common tangents.
3, according to the described developing apparatus of claim 1, it is characterized in that:
Described extension is second arc section on its xsect, its radius-of-curvature equals the radius-of-curvature of described first arc section, and first arc section and second arc section are positioned at the same side of their common tangents.
4, according to the described developing apparatus of claim 1, it is characterized in that:
Described extension on its xsect linearly the section, this straight-line segment and described first arc section are tangent or crossing.
5, according to each described developing apparatus of claim 1 to 4, it is characterized in that:
The public string of described contact site and developer roll with described contact site and the tangent line of extension junction between the angular range that forms be 20 °～60 °.
6, according to the described developing apparatus of claim 5, it is characterized in that:
Described angular range is 40 °～50 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200612802U CN201122234Y (en) | 2007-12-07 | 2007-12-07 | Developing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200612802U CN201122234Y (en) | 2007-12-07 | 2007-12-07 | Developing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201122234Y true CN201122234Y (en) | 2008-09-24 |
Family
ID=40009468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200612802U Expired - Lifetime CN201122234Y (en) | 2007-12-07 | 2007-12-07 | Developing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201122234Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018045013A (en) * | 2016-09-13 | 2018-03-22 | 京セラドキュメントソリューションズ株式会社 | Developing device and image forming apparatus including the same |
-
2007
- 2007-12-07 CN CNU2007200612802U patent/CN201122234Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018045013A (en) * | 2016-09-13 | 2018-03-22 | 京セラドキュメントソリューションズ株式会社 | Developing device and image forming apparatus including the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080924 |
|
| CX01 | Expiry of patent term |